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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb38ba0b27109c3c7d81d8e2c781fdcf0d7b38e91c1bbf2698cc79c78f859b53' 
  AND token = 'M8+hSn9NqAFik7pZBPY/e7iBgNFz06TqYtQlWUqKfBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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