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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1c7e0717a8ec1cebd4c19d8bfda3ad71fa113ab625ac0c80cb2f1940e5e59f' 
  AND token = 'sgBISvnRpvGSKau2ap919Lh2rns/mb30CdMWta3+KkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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