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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40bf1058d7b575011362b4fa01d7093f9a9833f6179595697ef7490d45c1539' 
  AND token = 'gQsiUDoYjvYaEqwGPvQnSSpebjRnSI0Y6bfNWfFp4nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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