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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d90cafe64bd12ab18e7c77d530ed5055341a702d837ff72509f5a45de1105dd' 
  AND token = 'sfe38YysNSQ5xpBDwsZ4RanD1dtBa2AWZUGWiHUggfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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