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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3147a1e354777a7e56375cc1180895ced91b765bfc8db1085a2da40b3ce63e8a' 
  AND token = 'FFiEp45S/bR81IwboQ2kxOf2u62+7+LkWvSbiSIOfxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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