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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a31e31ef3918d59623f780bff6db0a5f6d200866edd4443714688502fb9b47' 
  AND token = 'K4QzFGWtAlGqDcN7+bmj9Y1O7idrrTkrMZRzc9iFk+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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