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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1143c796309e2aabec79d04b4ba8fdc73370a102576509870e7b170450b5a4e7' 
  AND token = 'tuC72mibuz9FQ94cO7gAp3P1H+D0RVwtzw7v3z3Zb50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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