SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92814172bb80cc49c452cd5384f646a318fba92fd567dacb74c578b8205232c' 
  AND token = 'TBcV8+c9+QULgSks9dOJ1MgDmfR0oqJXZb3/qkahIlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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