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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb6476a5da15f5a04a805381eb3a3332ee1787972437dc023ba628d60112ba9' 
  AND token = 'a/gu6SbJO4/2eXqadrrCuuvV3wnw/KZhozMgTzeRNf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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