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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3514bd1fda16fc330960db3bbb5d12e9ab41a512d91e08e164bdfb02d8c1afe6' 
  AND token = '+K62RAx0oVB4RwRX0/qRwdB36qCOMjK6FHLkyLhaU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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