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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6b07503cea0a8eeb8ea9c5a482903f11e2c199ff65eb56a0df2cef93f1f390' 
  AND token = '/kj0TbQ7gq5B5oCnWwp+TbYssBxnH31NRO1tRSW69CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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