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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eafc49e1ce69b54ec7d87ff7017828677ccf40d1b07bcd5b231ea5acac64284' 
  AND token = 'pQd4aBVzcR7gtHcDKPskMT6ZBXOV1DOnQ2phGnlZQWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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