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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319606515b32f2804c8e5ab7fbf6a32b1156a58c4b538bf77682c43b916a010d' 
  AND token = 'Vn0nGt1V+L2NgnaHHMlyPEF41ft/enUQsdpy/I+Ygp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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