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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1a70655a6ba0c36bff5336f67547605031e04bd46e237b5571cf7a119303cc' 
  AND token = '09PRdPwxed2+IdBAGwBONz12dhTLTjDPHkkuPx5J+mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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