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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1deeba2492c439eb2f5ecb7d743f372b477e982fed1dadd7fd805adc5c374b3a' 
  AND token = 'zv/snmXSCYtYjCD3k6zsCIPrL7WgD7dD3iyqzCcwh0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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