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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc29c522587936a0f0e002bb635745b1b127b856e669bf67d907a799620cb15' 
  AND token = '/lc+CA8YKi5Zs8/qgUqxm3OudbgLz7XMcRbCvfS211c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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