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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af6d22a491d90577ff691d6e868c54982236c447ab165f9cd4ec8e2ff320b22' 
  AND token = 'CXk2dLQa0FbicICO0wB0M9puXfO7cBZTAnflF0AwYxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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