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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6daadf962fc2cfc3153f8f75f877433f687b38ed79afe2ab61d152e15b575e3c' 
  AND token = 'IBF7TBX83CaJuQeEqIL4TYPbOGc3s8diHQ6goLs8zSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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