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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430f97697dfc73818c828621ed3ca78a296f2be758a18be9eb28a94a4b783d94' 
  AND token = 'w25T5lWCHWKSRf9UN/PWj6/nWr01B+G/v8tckkapN9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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