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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dade50caef8a87e3cdadb15cae4cbd30ac303f6f53cc36d267c8b637c3e5afe9' 
  AND token = 'NYiAW0m7P5kiD2jnIsydVVwo4LsmYHHodHr3AdsxQyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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