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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fc4ddea55b26b3b9d7fd9ce93d0f2a7975b3e5b8dd156f9e929a288d442c91' 
  AND token = 'FP1MSenuz/Mv7TI8VXoBHoBtgX60jpksNpITUQ4wGXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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