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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6698afd953290140559113259d91b299bfa0e678ba66c9e8224128055110ae8' 
  AND token = 'zMmTA12J6Eyrt632H+S6H3TZQ1/+YwTHwf+EhfxAJ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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