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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73715aabd712522bdf8bef573c49d93a501e0f7248b0f3f321f06884f8824f3' 
  AND token = 'duw6uPQZKwd1T8iCAlW6fOfeUvFO8EHXYrKoY6ag8bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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