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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19ef883726ed7c86474b08bd3f957a4ab4c47ecbbd661cd782cfc5dd2b1dee0' 
  AND token = 'Yk6q3vZ7nePb76YiP29qOdgw98VxH7gFU2ed6Yfknck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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