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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09366780184ad938d97053d83ce5b2a82d8ae9ba0033cad147f460aa77efdbc4' 
  AND token = 'Ein/Asd+QI3jj8dGey3Lq79pEBdmf4eeOxpFRCYB4TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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