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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373c1049719c594c225e95a03ac73735cfa52e8f8ec4127d0df91ca165ea23c1' 
  AND token = 'K5uzJz/BMfyTtwf9tY5+2P7u81VdoPKs1dQUpHYDUlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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