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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7675e4ec9566e0e5e1777c053b49f3ac5beee95040fb1aa19cfd1b80fc8e6437' 
  AND token = 'UFLarlK+aTlAKiMWS8ej8ma3bKpAgNfgf57W5Ajes/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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