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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f239270c4bed1d14f463901a1836b5838e59590b477640c8bcc5f55368c588a' 
  AND token = 'l8HajebRCB8HBu07NysDK2xr11ui20H3v2T1hHM++T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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