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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ee8d60af67811e8d92f3b60c19ccd201ea86f46030092067fcf8c2f27fde2e' 
  AND token = 'JcBmGPRfCKn6Dda4Cmh/6kRv5Yoa/9hjrLknOO1FWSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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