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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd77dbb448ad417fa3182a4a40d861dcc685deca4d03094cbae91ded348ba63a' 
  AND token = 'IV3Q0bDE1rI9ezQ5758voLJikesiO2mGuvOdnBUS+CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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