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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176d33d50a883d69ac8fa66a271c60580bb01eeb922bcf1c32a583ffb04d5e69' 
  AND token = 'DauVB9O/pRntEtueBANffnguLSlwNAu/6wQTP97HmQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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