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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200ff37546d0be9315ac617921c319f8949a28ee98bf7a049654fcc3f3bf51c3' 
  AND token = 'AeB+O6S1rmUwBzc+GwBd06LWqZ63/2kW0UXlXGt6odQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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