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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc62f5e2dffc4ae62f973c2632e9418468d2c4a7c8bdf1675abd9e25f3c40a7' 
  AND token = 'CpwRE0h18/btfi8MBbG4W9ovbKRlPzvcOOGheLyp1N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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