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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76df9ba47c6ee9c40f284ebe59a1fc2a8aac4038dbc0a1b3b942f0581de63ccc' 
  AND token = 'Cml5HEV6HsUAq9SAaHHlbn008tmwfLrxQE4vFxZdck0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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