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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e687a85f67742191b44b91a4b233f1ed2a4895f5c2cbbcc75f9d8ddd2c5e01a' 
  AND token = 'uxbydJ5avP63QfsrbIPF5276tHBsP/1sCHO4/30YJCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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