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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93abb0744e26cbfa1db0ea9c55776aa1baa49c5074d0f69730b55f75a8d952d8' 
  AND token = '24jEp47nRgGw6skVkEIUsckMBa6f6mUy0k77Qol/eo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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