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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42325ae79ab71fd22e8fdc526c1cd437c04c14a7471c9dc7d9b6c55dba03b1ee' 
  AND token = '1qrX+x72c6xYDcQbxjgdvtq3WkcCh3Hueuqda1/pDyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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