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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9774c81a545a85ef7af3764205795c50ca966afe73b98540ec977a7a11937956' 
  AND token = 'B+55r9Z/933bIJTJjwN49hshdV590vCndRCCP+GcuzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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