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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be202cb9adc21d4de56a8898526ce0b10872a08a61e442d753cae55dd67d2905' 
  AND token = '+nIAD3k6vsl1amebP1JuHG+5mVLAvD/j1Som57Y9t98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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