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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac0491275beeff0c04d134f9d2744de1b3216c4b1263134890f9de593706a67' 
  AND token = 'xQFx9G0OoySxneXp7zpK9/KZv07Va/oZIISE/2X00qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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