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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a60649ba05dd4e6ef812d735949612f6d615d7433f968274a7dbc248e56ac16' 
  AND token = 'V7dLP1KAOf2ejASxQk6RhahF7NCR3I368W8I6+hR+tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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