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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587fa0b8ca0d4bbbc6fa3e59fa0e235553abcc3c5115224ad531e22f3b805865' 
  AND token = 'FXqpKn+YGbdpzegUgSB24xWNaV7c63Cdatd8MRgfwLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}