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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce5406fa597b5b5b485565a15872e60def1ed286467002d9116421db625c78f' 
  AND token = 'kZi5pZXpobioh++I6YdO8kk6XGkzJQaZb7TxZ6FK4IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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