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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90b3554d24df4936b0218bdd24ddb8ea0a9327647380a24e9d7af85f3aed35f' 
  AND token = 'cGlOUZbKXZ1gwfEn7OGqAEwi5w9kaL2OTVBz7OEOswE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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