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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36859100628a568b394e8d1d374bbe7e57e9a3ad31ebb1b864f715d2ecb4a62' 
  AND token = 'JAB6Mh/j+6EHgcq3E5Tcheeb/K7lHhU9afS8fPOzLF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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