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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00efc2efe13fd9ec04c43421c3a9a95f7252ea15427b9bdd4ccd15a23404076c' 
  AND token = 'E18EPBEfB5lAbJz+BfviDc3Cwd6KUP7Oh48VQZ5wcHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00147

JSON explain

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