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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261ee37d2a760a62c7d7c55c4dba045bcbf591f7dd1d106149f239a1f61ddad9' 
  AND token = 'YdHy3TkAA+XaArrheXZ2vC33wXUMgxhz0w0vwIA+5oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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