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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf049c71aeb95e1b46ba2920fd5c6829c79a9c482aefee2d4198621cb6f85ae' 
  AND token = '5cEVTBGB8IOLrI8aa6PtmnqMinvgqChZvwF4yZhdY5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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