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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f587d5a408fc1440e32031b9cfef2dc54bbb763bf267d07fc15e2515703e08' 
  AND token = 'zi6ZYsnbUtvze2lr9kHnUFm5t83ca01IWoSlraQ/rHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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