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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec1cac22dd050efea84264dc4e668d28b711de2f37238ef062ac7090e866ac2' 
  AND token = 'fFiaLBZp1VieQk4dlau8zECtTWuM7Xgwm5mO3NyAtD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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