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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc2e3b966e14dc4675bf8603eac3b3856a668d607707c8a61361010b540e0cd' 
  AND token = 'eHKxqC0O1uk78aimfMojhqWJdGyp1qzEYw4iSmHkvk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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