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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1adc87ebe03b91f159dc26b2b2d1d556b1c114b6376113aa4c4f9145f934706' 
  AND token = 'RFQSRzhEvWRdecYFd1FSbrfaaKEkRzqhGKX+Fv8zX/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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