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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09e1f1566a2b3d7b78042edfc531bb9330302d097656071adb571e98c1c4e75' 
  AND token = '6IugzMJS3J5D4PCilQv61Y5B3CM+ox1zNMcKk4U4l0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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