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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae2833d159ab028b985a155df20b7029be09ba49e92c80773045c5b0e15e1f0' 
  AND token = '+v8CQE2+P4vBbgVMLjbYpLYClbav83ZdYJbXLjjlP6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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