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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7fae04cc0b47daa15b21abf1f3238d7225bf97f8f95dcaf7c31282960d26df' 
  AND token = '0LeCYFUAqwYzInO5r0ftcySsj/OEfm7Isi7eIkBGOtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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