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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a42101e619d8786c44c016d8f00d65dbbc5742b170d96db7955d93373476b6d' 
  AND token = 'n7OkvzYD1TU7yImVHltoP4bSG77GsRTu5HsIWDgUjTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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