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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9f1bbef60c0ad9afb5017af0a744d5b8e0c31dd79e9c64e1dd8727438a8006' 
  AND token = '0RzdqZQeAzl4fbux6o+ogAQ1Kq+cxwskmQFao31fskA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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