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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a24a5b0bf293201360155cf5f501dcb3bff70d753d75a12b0c21b3dc3ff169' 
  AND token = '+eXDVocsSIGN6vktAUzfANmrYgNYbdQKDw388UVqAy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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