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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a208aa4c4bd53c56ec9eb4559680a2f07f6a94b82dc746e5d583e682c0403e67' 
  AND token = 'KwKbYA5EEet2V8Q6ySeqCgUHR3v4cqYtPMLiyRN0p9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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