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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9df025e1ce80b2795603175f74ceee8a8fc1f5ff8b7ff4d242d71344dd5c1ff' 
  AND token = 'tO2/Wadjd8iyC1gvu6I/YmMia0bORqAZLMEg5+x/Og0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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