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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78174fffdc83dfce157b960a92cb9292f621071ab464b2cdb3ca917219823356' 
  AND token = 'MzW1QThRMf5rzwsGAa4T8cZlV30SVW9iWSBohq5Kf90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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