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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8b2e71fc7e66d54ba2afc6c1cabcb6ad94fb65ee2ceadc7d14ed73039aa9d4' 
  AND token = 'iOXKwU71uQBvAVM3T6EUhL1vb9XyQrSHuBFGt1p8cCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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