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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea44606c9657e1fedb9020d8537f6d2e5fdc1b20c582c059bfb130bb861a8c30' 
  AND token = 'ywMDwQ+sKI4/Gfm8VpbgX3PI4i5cOWWOdQhfSf9hAWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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