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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0211462e7c4b012c57d5ba068b3d4c8f89378dbe133e7078ec135cfbb0170a6c' 
  AND token = 'DKzNdsmwZDQc68mpRSUPJ30HFZwsV8oChYhR8K5q2Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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