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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554117f1e3b00f791cc95d92af1312f72e6e97b8943b30048f0497b907f17e65' 
  AND token = 'CAAhv24LdLlwcdeTvN4zXV18+Dq2XNbmByTm+JlsQYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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