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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75d20e2c964e7c180152d3d38705a10ee358a64e78a0262149539a3c4067592' 
  AND token = 'RjuCvE9bj0Y5IUGAOA7nxVESar2LlycVSPA5vb82IEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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