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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b005e9e1dc12c1d9c51c5f0739854dc63d9d976640cdca0a44e7bdde81b043a' 
  AND token = 'K+GuYBH/0IEJznRdRvPKnKdcdh9e6KXlTnTa2rRePjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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