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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9665ca69bf3359958b94c3bc3ef6652e1083c9d330bf4758de68f6848ea305' 
  AND token = 'zOwdD5fo6gP9hqWoLq7Eroi3is0j4cB89F2DKfib3UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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